I'm guessing this is a chinese algae eater...
Many people disagree, but I feel bottom feeders are negligible when calculating tank load. They don't add to water pollution, they just recycle. though they do use oxygen, so you have to keep that in mind.
(There's also the idea that bottom feeders release
ammonia into the water faster than the
detritus would ordinarily break down (by eating it). Again i disagree. I think it just removes the delay...as the new detritus waits to decay, the old detritus is decaying and polluting the water. It's the same amount of pollution entering the water column either way.)